Reamer for earth boring buckets



July 4, 1933. F. A. SCHROEDER REAMER FOR EARTH BORING BUCKETS Filed March 24. 1932 2 Sheets-Sheet l Illlllllllllllllllllll July 4, 1933. F. A. SCHROEDER REAMER FOR EARTH BORING BUCKETS Filed March 24. 1932 2 Sheets-Sheet 2 FIG.3

ATTORNEY Patented July 4, 1933 UNI ED STATES FREDERICK A. SCHROEDER, F ROCHELLE PARK, NEW JERsEYJssIeNoR To RAYMoNncr CONCRETE PILE COMPANY, OF NEW :YORK, N. Y., 'A CORPORATION or NEW JERSEY REAMER FOR EARTH RoRINeTuCrrETs Application filed March 24, 1932. Serial No. 600,840. i e.

This invention pertains to a rotary earth boring bucket, with special reference to an adjustable reamer mounted on the bucket, by means of which the hole bored by the bucket maybe enlarged or reamed to a predetermined diameter. Apparatus for that same purpose is disclosed inmy copending application, Serial No. 570,560, filed October 23, 1931. An object, of the present invention is to disclose a reamer more simple in design, less costly to manufacture, and less likely to get out of order in service.

Further and other ob ects and advantages will be apparent from the specification and claims, and from the accompanying drawings which illustrate what isnow considered the preferred embodiment of the invention.

Fig. 1 is a vertical cross-section through the center of the bucket,on line 1.-1 of Fig. 2 showing reamer retracted.

Fig. 2is a cross-section on Fig. 1.

Fig.3 is a view similar to Fig; 2 but with reamer blades in operative positions.

Fig. 4 is a fragmentary view on line 4-4 of Fig. 3. r

Fig. 5 is a fragmentary view on line 5- 5 of Fig. 2.

Fig. 6 is a fragmentary view on line 66 of Fig. 2. p

Fig. 7 is a fragmentary view on line 7-7 of Fig; 3.

Referring to the drawings, the rotary bucket comprises a shell 10, discharge gates '12, and bails 14, thedownwardly projecting arms of the bails being attached to the bucket shell 10.

Mounted on bails 14 axially of the bucket is a drive hub 16 having an integral flange 18 through which pass bolts 20 securing: it to the bails. 1

Passing vertically through the bore of hub *16 is the hollow drive spindle 22. The portion of the spindle within hub 16 is cylindrical and free to rotate through a limited angle with relation to hub 16, as will be explained. The upper portion of spindle 22-is provided with a square socket 24 into which is secured, by keys 28, the lower end of the rotatable drive shaft 30.

line 2-2 of b it The weight of spindle 22 and itsv attachments is supported on the top of hub 16 through flange 32 of the spindle resting on flange 34 of the hub. r

Flange 34 of the hub has two diametrical 35 lyopposedforward-drive ears 36, and two re verse-drive ears 38. Flange 32 of the spindle has two diametrically opposed drive lugs 40, each projecting downwardly into the space between an ear'36 and an ear 38 of the hubf oo as may best be seen in Figs. 2 and 3. It will be apparent that spindle 22 may rotate relatively to hub 16' through an angle represented by line 42, and that when lugs 40 are against ears 36 (Fig. 3) the spindle is in position toes rotate hub 16 and bucket 10 clockwise, which [is the operative direction of rotation. If the direction of rotationof the spindle be reversed, lugs 40 willrotate through angle 42 from the position of Fig. 3 to the position of m Fig. 2, in which lugs 40 are against ears 38. Further rotation of the spindle in that re verse direction will cause hub 16 and the bucket to rotate to the left (counter-clockwise). V r -75 Keyedto spindle 22 below hub 16 is. a collar 44 having a pair of diametrically opposed arms 46, theouter ends of which are connected by links 48 to crank arms 50, the hubs of whichare keyed tothe lower end ofso vverticalspindle 5.6 (Fig. 6) supported for rotation by bails 14 and bearing-blocks 54 and 55 welded to the under and upper sides of the bails. The, upper endv of each spindle v 56, above bail 14-, is shaped to'form a support 's5 58for a reamer blade 60, adjustable lengths wise relatively to thesupport on a guideway 62 forming part of thes'upport.

hold the blade I 90 Bolt 64 and nut 66 serve to in adjusted position. I

The relationship of arms 46, links 48, arms 50, blades 60, and other parts of the appara tus is such that whenever lugs 40 of drive spindle 22 are against ears 38, as 1n Fig. 2, V sp1ndlesf56 have'been' rotated to retract reamer blades funtil no parts of the blades project beyond. the bucket.

I On the other hand, whenever-spindle 22 is rotated to place lugs 40 againstears 36,.spindles 56 are rotated to move the reamer blades outwardly totheir] Y I PATENTTOFFICE shell and welded thereto, the reaction reach ing plates 68 through stop-lugsYO forming a part of supports 58.

From the above it will be apparent that the reamer blades are automatically forced outwardly to their operative positions whenever the bucket is rotated clockwise against any resistance sufficient to bring drive lugs against ears 36; that the effective diameter of the reamer is predetermined by the adj ustment of the blades in supports 58; and that the reamer blades are retracted whenever drive spindle 22 rotates countei' clockwise relatively to the bucket, complete reaction bcing attained when lugs 40 reach cars 38.

If desired, the reamer lades may be formed with upturned outer-ends as shown at 72 (Fig. 1) so as to aid in scooping the detritus into the bucket. e

It is to be understood that the invention is not limited to the specific embodiment herein illustrated and described, but may be used in other ways without departure from its spirit as defined by the following claims.

Iclaim; V a

1. In apparatus of the class described, in combination, a rotary digging bucket for boring a hole in the earth, a hole-enlarging reamer comprising blades mounted at the upper end of said bucket for swinging movement on vertical axes, and bucket rotating means for shiftingthe reamer blades from inoperative to operative reaming position while the bucket is in the hole in the ground.

2. In apparatus of the class described, in combination, a rotary digging bucket for boring a hole in the earth, a hole-enlarging reamer comprising blades mounted at the upper end of said bucket for swingingmove ment on vertical axes, means for rotating said bu cket in the hole, and means interconnecting said rotating means and said blades whereby said rotating means may be actuated to move said blades about their pivots on said bucket while the bucket is inthe hole inthe-ground.

'3. In apparatus of the class described, in combination, a rotary digging bucket for boring a hole in the earth, a hole-enlarging reamer comprising blades mounted at theupper end oi said bucket for swingingmovement onvertical-axes, means for rotating said bucket in the hole/and links connecting said rotating meansand said blades whereby said rotating means may be actuated to move said blades about their pivots on said bucket while the bucket is in the holein the ground.

4. In apparatus of the class described, in combination, a rotary digging bucket for boring a hole in the earth, a hole-enlarging reamer comprising blades mounted at the upper .rotates relatively to said bucket.

5. In apparatus of the class described, in combination, a rotary digging bucket for boring ahole in the-earth, a member mounted at the upper end of said bucket for rotary movement on a verti 'al axis, a reamer blade supported by said member and adjustable across the axis or said member, means "torrotating said bucket'in the hole, and means interconnecting said rotating -means and said member, whereby. said rotating means may be actuated to move said member about its pivot for swinging said reamer' blade from inoperative to operative position.

6'. In apparatus of theclass'des'cribed, in I combination, a rotary digging bucket for boring a hole inthe earth, a member mounted at the upper end of said bucket for rotary movement on avertical axis, a reamer blade sup ported by said member and adj ustable'across the axis out said'member, a shaft for rotating said bucket in the hole and having a limited angular movement relatively thereto, a crank arm on saiu shaft, a crank arm on said member and a link interconnecting; said arms whereby. said shaft when moved angularly relatively to theibucket serves to shift the blade from inoperative to operative position.

7. In apparatus'of the class described, in combination, a rotary digging bucketforboring a hole-in the ground. reamer blades pivotally mounted on'said bucket, and means oper ating to first move the blades to their Qperating radius and then rotate the bucket in the "role.

8. In apparatus of the class described,-in

combination, a rotary digging bucket having cutters at its lower end arranged.to cut and throw detritus upi *ardly into the bucket, hole reaming blades pro ecting laterally fr'rom' the upperend of the bucket and arranged to cut and throw detritus into the upper end of the bucket, and means operating to throw the blades to operative positi'onand then rotate the bucket,together with means for adjustmg the operatlng radius of-the blades.

In testimony whereoi I hereunto affix my signature.

rnnnnnick a. son'nonnnn. 

